Exhaust Evac system??
I made a good catch can half full of stainless kitchen scrubbers and each valve cover runs to the bottom of it w/ 1/2" hose, the exhaust pulls from the top of it though 3/4" hose and welded to the exhaust i used the factory air pump check valve. Its not like a vacuum cleaner but before i added it my oil would get milky looking (running E85) with it the oil looks brand new months after I changed it... so im guessing it works great.








